Electric elevator.



PATENTED AUG. 7, 1906.

D. LARSON.

ELECTRIC ELEVATOR.

APPLICATION FILED JULY 24, 1905.

2 SHEETS-SHEET 1.

. certain connected parts and electrical circuits which I employ incarrying out my inven.

1 UNITED STATES PATENT omen.

DAVID LARSON or .YONKERS, NEW YORK.

' ELEGTRIO ELEVATOR.

No. 827,924. e

I will describe my invention in the following specification and pointoutthe novel fea-' tures thereof in claims. Referring to the drawings,Figure 1 shows diagrammatically an electric elevator with tion. Figs. 2,3, 1, and 5 illustrate modifications of one part of the Fig. 1. Fig.'6'is a side e evation, partly in section, of an 'electrically-actuatedbrake. Fig. 7 is a front elevation of a detail of a lockvation the 1positions.

ing device, and Figs; '8 and 9 show in side ele parts shown in Fig. 7 indifferent Like characters of reference designate corresponding 'parts inall of the figures.

21 is themotor-shait, and this may be connected to the inding-drum- 22by suitable gearing within'the casing 23.

. arranged to 01 erate the elevator-car.

- designates an elevator-car, which may be connected to a winding-drum22 by means of a rope or cable 11. 12 is a counterweight which ma beconnected to this same winding-drum y another rope or cable 13.ZO-designates an electric motor, whicIh is t is shown in the rawings asan alternating current motor; but it may be any suitable type of motor.I

- is an electrically-actuated brakep It may be constructed'as shown inFig. 6, in

which an electromagnet 31 is arranged with a solenoid coil or winding32, within which is a loose core 33. The frame'of magnet 31 and i I alsothe. core 33 are preferably laminated to fit closel have a verticalmovement within the portion when used with alternating'currents. The

magnet 31 isLsupported by a frame 34. Di-' rectlybelow the'magnet aportion 34 of this f frame is finished to receive a 'wei ht or plunger35. These parts are preierab yarranged y, but'to allow the plunger'35 to34. The magnet-core 33' rests upon but is Speeiflcationof LettersPatent. 7 Application filed July 24, 1905 Serial No. 270.956

apparatus shown in pulse-current, w tomatically out down as soon as ithas done its work. This, then, is a particularly efficient Patented Au7, 1906.,

.not attached to the plunger 35." A lever 36 is pivoted at 36 to theframe 34 and is at tached at36 and 36 to the ends of a brakeband 37,which artiall surroundsa brake-r .pulley 24, whic isrigidly attachedtothe motor-shaft 21.- The other end {of the lever 36 is extended to apoint directly under the plunger 35, and the latter rests upon it; A

sprlng 38 may be placed under thelever 36 and arranged to partiallyovercome the action of the weight ofithe lunger 35 and the core 33."Before procee ing with the description of the rest of the apparatus Iwill describe the operation of this brake. When the magnet 31 isenergized by having a current passed through its winding 32,. it willlift its core 33.

A projection 33 may be provided on the upper end of the core33 and a,

corresponding recess 31 provided in the magnetic frame of magnet 31,. ifdesired, in

order to increase the length of pull of the magnet and to increase itsefficiency. As the core is not attached to anything and the magnet hasto lift only the weight of this core, the i core itself may be designeto have considerable weight. Moreover, as the core when raised has atendency to short-circuit some of the magnetic lines in the frame of themagnet 31, and as this has a choking eifect'upon the currentin winding32the latter may be designed to car a comparatively heavy im- 'ch willimmediately'be auarrangement. The spring 38 is made of sufficientstrength to lift the plunger 35 and move its connected parts when thecore 33 is raised from it. it will then push u the end ofle'ver 36, andthereby loosen t e brakeband '37. When the-current is cut off from theWinding 32 and the magnet thereby becomes-deenergized, it allows thecore 33 to drop down onto the plunger 35, and the combined weight ofthecore and the plunger is s'ufiicient to overcome the. action of spring 38and to apply the brake. The portion 3 1 of frame 34 w ich receives theupper portion "of plunger 35 ma be made a sufficiently close fit to actas a ash-pot andto retard the I movement of plunger 35. -When the coreis raised, it is clear of the plunger 35that is, it is arranged to'beraised above the upper limit of the plungers movement-so that novibration of the core due to alternations of the excitin -current orother causes will be transmitte to the plunger and the brake.

. it t -rotate-in t 'I will now describe a novel arrangement forReferring again to Fig. 1, 40 designates a suitable source of electricalsupply. here shown as a source of alternating-current -supply connectedto the rimary of a transformer 41. through a main switch 42 by means ofthe mains 43, 44, and 45 to various arts of the apparatus. designates aase, upon which is mounted an electrically-actuated reversing orstarting switch for the motor 20. Thisswitch comprises twoelectromagnets 51 and 52 and certain contacts and other parts, which Iwill now describe. 51 and 51 are stationary contacts situated nearmagnet 51. 51 and 51 are movable contacts arranged to be closed againstthe "stationary contacts by means of a spring 51 whenever magnet 51 isenergized and lifts its core 51*, but to be pushed down and away fromthe stationary contacts by the weight of core 51 when the magnet is notenergized. The main 43 is connectedto stationary contact 51", and themain 45 is connectedto stationary contact 51. One of the motor-terminals26 is connected to movable contact 51 by conductors ZG -and 26 andanotherof the motor-terminals 28 is connected to the other movablecontact 51 by conductors 28 -and 28. The main '44 is connected to thecentral motorterminals 27. -It is evident, then, that when magnet 51 isenergized and allows the contacts which it controls to be closed themotor will receive current from the line and will rotate'in onedirection. Similarly'when magnet 52 is energized and lifts its core 52"a spring 52 will close other contacts, which will cause the mains 43,44, and 45 tobe connected to' the motor-terminals 28, 27, and 26,

respectively, and will furnish current to the motorin the oppositedirection and will cause e otherdirection;

locking and interlocking the movable contacts of the reversing .switch.A threearmed lever 58 is pivoted at 53. One of its arms 53 extends to apoint beneath magnet 51. Another oi its arms 53 extendsto a pointbeneath magnet 52, and its third M11153 extends to the lock 54.Extending below the springs 51 -and 52 and connected to the parts whichcarry the movable contacts are projections 51 and 52 which are adaptedto engage with the arms 53 and 53, respectively. When spring 51 pushesmovable contacts 51 -and51 up, the projectio'n-51' first-strikes againstthe arm 53 and prevents the contacts from reaching thestationarycontacts above them unless the lock 54is open and'allows thearm53 to move with the movable contacts. If the lock 54 is open andallows such movement, it may be seen-that the roj ection 51 will holdthe arm '53 -in-a raised lowered position, which will cause the projection 52 to prevent the closing of the con- It is The secon ary isconnected position and the arm 53 in-a tacts below magnet 52 as long asthe con tacts below magnet 51 remain closed. The lock itself com rises'asliding bar 54, which is ,rirovided wit tro the agency of aspeed-governor 55. This governor may be connected to the motor by meansof a belt 55, Which'runs over a pulley 25 on the motor-shaft 21. Aprojection/53 on theend' of arm 53 is arranged to pass through the slot54 when the motor is at rest and the parts are in the positions shown aslot 54 and which is con led by the movement of motor 20 through inFigs. 7 and 8, but to abut against and be locked by sliding bar 54 whenthe motor is running and the latter is raised by the action of thegovernor 55 into the sition shown in Fig. 9. The result of this cokingarrangement is that it makes it impossible for one to reverse thecurrent to the motor before the latter has been brought to rest.

I will now show how 'the reversing-switch may be 0 erated electricallyfrom a distance.

A manna ly-operated circuit-closer 60 may be provided at a convenientplace-do! e1;- ample, on the elevator-car 10 ,as shown. Thiscircuit-closer or switch 60 comprises a pivoted switch-arm 61 and threestationary con tact-segments 62, 63, and 64. The segment fi'2isconnected to main 44 by a conductor 44. The segment 63 is connected toone end'ot the Winding of magnet 51 by a conductor 63 and the segment 64is connected to one end of the winding of magnet 52 by a con ductor 64.The other ends of these magnets are connected to'the main 45 bya'conductor 45. Now when the switch-arm is moved to the left a circuitis completed from main 44 through conductor 44', segment 62, switcharm61, segment 63, conductor 63, winding of magnet 51, andto the main 45 byconductor '45. This will cause magnet 51 to be energized and to lift itscore 51, and thus to control the operations before pointed out.

Similarly when the switch-arm is moved to the left a circuit will becompleted from main 44, conductor 44, segment-62, switch-arm 61, segment64, conductor 64, winding of magnet 52, and conductor 45 to main 45.This will cause magnet 52 to be energized and to erform its functions.-

I wil now describe my novel arrangement for automatically controllingthe acceleration of the motor 20. An opposition element 70 I cluded inthe rotor-circuit, and the motor willthen rotate slowly. i 80, ,81, and82 designate a series of electro- It is here I magnets similar inconstruction to ber of ways-as, for example, by making the ores of'different "weights or of different engths or, as shown, by making theircoils or windings of different number'o'f turns.

- The winding of magnet 82 has the greatest number of turns.

Consequently it will act first.

manner similar to that already described are arranged to short-circuit aportion of the resistance 70. The winding of magnet 81 has the nextlargest number of turns, and as the current in the coils increases itwill act next. The contacts which it controls are arranged toshort-circuit another portion of resistance 70. In a similarmannermagnet 80, the coil of which has the least number of turns, willact last, and the contacts which it controls will short-circuit theremainder of resistance 70. In this way the resistance will be cut outfrom the motor-circuit in a number of steps and will allow the motor totake more current from the line and to speed up.

The above operation should be gradualand r0 ortionaltothe speed of themotor, whic 0 course will vary with difierent load conditions. This maybe accomplished in a number of ways. I have shown several of these waysto illustrate this part of my invention. I

In Fig. l the lower ends of the windings of magnets 80, 81 and 82 areconnected to the main 44 by a conductor 44 h Their upper ends areconnected by a conductor 44 to one end of a variable resistance 90. Thisre sistance is' connected to a series of stationary contacts 91, overwhich contact-arm 92 is arran ed to be moved. This arm 92 is connected ya conductor 44 to the conductor which runs between contacts 52 and 51,so that when magnet 52 is energized and allows the contacts which it uper ends of the controls to be closed the windin s 80, 81, and 82 wil beconnected throug resistance 90 and the conductors just pointedoutandcontacts 52 and 53 to main. 43, and when magnet 51 is energizedthey will be similarlyconnected throu h magnets 51 and'51 to main 45.Thus the magnets will receive from the mains through resistance 90. Thepivoted contact-arm 92 may be mechanically connectedto the slid- 111grod 54 by means of a link 93. This sliding rod is connected, as has beenshown, to the overnor 55, which is belted to the motor-s aft and isarranged to be lifted an amount proportional to the s eed of the motor.This in turn will cause t e pivoted contact-arm 92 to be moved over thestationary magnets. 51 and 52, before described. In this case,

The contacts which it controls in a more or less of it in circuit withthe supply,

connected to the plunger 10 a pivoted arm 92 passes over the contacts itcloses circuits to the magnets one by one. The rest of the operation issimilar to that already described. i

. In the modification shown in Fig. 3 the pivoted contact-arm 92isfmoved over stationary contacts 91', as before but these con tacts areconnected to various points in the primary of a transformer 100, so asto include and the windings of magnets 80, 81, an 82 are connectedacross the secondary of transformer 100, which of course induces anincreasing voltage as more of its primary is ener ized, and thusfurnishes the desired variabd e current to the magnets. 1 In .ig. 4 apivoted arm 92 is mechanically.

of .a chokingcoil 101, which performs the function of resistance 90 inthe arrangement shown in Fig. 1. Fig. 5 illustrates another form ofinductive device or transformer, in which amovable core 102 is-moved bypivoted arm 92 within primary and secondary coils 103 and 104 byaltering the magnetic lines within said device, and thereby causes theinduced voltage tobe varied in the desired manner.

The current to the electrically-actuated ereby vary the current besupplied by connecting the leads 32 may an 32 from its winding 32 to theterminals 26 and 27, as shown in Fig. 1, in which case the winding 32will 'beconnected across two of the mains whenever the circuit is closedto the motor.

The special and described tionfor patent, Serial No. 265,883, filed June19, 1905. The present application shows manynovel features ofmotor-control syse tern. I have illustrated the invention by showing itapplied .to an but it is evident that it is applicable to many analogoususesin 'fact,. to any system wherein it is desired to control themovements of an electric motor from a distancetgrpe of magnets hereinshown 1 claimed 1n another applicaelectric ,elevator for example, themotor or motors on an. elec .tric railway car or train or those used foroperating mi l=-tables. The motor-accelerating device may lee-used inconjunction with many forms of motor-controlling devices, such asregulating-transformers and various types of switches, whereby manytypes of.

motors may be controlled. As the operation of this arrangement dependsupon the speed of the motor ltself, it; is evident that accelcratingdevices will be actiiated proportion to the acceleration of the motoritself, which of course wiilbe proportioned to the speed of the motor.

What I claim-is 1. In combination with a motor, a reversing-switchtherefor, electromagnets having cores free from saidreversing-switch-but arranged to control the same, and independent meansfor actuating the reversing switch when one of the magnets is energized.

2. In combination with a motor, a revers mg-switch therefor, a pair ofmagnets having 1 cores free from said circuit-closer but arcorrespon gone Of'Sflid magnets is-energized. I

44' In combination-with a motor, a reversing-switch thereforcomprisingtwo sets of contacts, a pair of electromagnets, cores therefortree from said reversing-switch but arranged to control thesame,independent means for actuating said reversing-snitch and closin eitherset of its contacts when the corresp ing one of said magnetsisonengized, and means for preventing the closing of either set of saidcontacts when the other set of contacts is closed. i

5. in combination with a motor, a reversing-switch therefor comprisingtwo sets of contacts, a air of electromagnets, cores therefor free omsaidreversing-swi-tch but arranged to' control thesame, independentmeans for actuating the reversing-switch and 4 closing either set of itscontacts when the corresponding one of said magnets is energized, anmeans for preventing the closing of one set ofcontacts While the motoris running.

6. In combination with a motor, a revers ing swi-tch therefor comprisingtwo sets of contacts, a pair of electromagnets, cores therefor free fromsaid reversing-switch but arranged to control the same, independentmeans for actuating said reversing-switch andclosin either setof itscontacts when the correspon ing-one of'said magnets isenen gized, meansfor preventing the closing of either set of said contacts when the otherset of contacts is closed, and means'ior prevent ing the'closing of oneset of contacts while the motor is running. E

7 111 combination with a motor, a reversing-switch therefor comprisingtwo sets of contacts, a pair of electromagnets, cores therefor free fromsaid reversing-switch but arranged to control the same, independentmeans for actuating the reversing-switch and closing either set of itscontacts when the corresponding one of said magnets is GHBI".

gized, and a locking device for said reversingswltch actuated bythemovement of the mo; tor. i 8. In'combination with a motor, areversrag-switch therefor comprising two sets of contacts, a pair ofelectromagnets, cores, therefor free from said reversing-switch butarranged to control the same, independent means for actuating thereversing-switch and closing either set of its contacts whenthc corresponding one of said magnets is energized, and a locking device forsaid reversing-switch actuated by the movement of the motor, arranged toreventthe closing of' one set of contacts af ter the other set ofcontacts has been closed unless the motor is at rest.

9. In combination with a motor, a reversing-switch therefor comprisingtwo sets of contacts and apair of alternating-current magnets, cores forsaid magnets free from said reversingeswitch, one of said cores arrangedto control one set of contacts and the other arranged to control theother set of contacts, and independent means for actuating thereversing-switch and closing one set of contacts when one magnet isenergized, and other means for ctuating the reversingswitch and closingthe other set of contacts when the other magnet is energized.

1D. In combination with a motor, a reversing-switch therefor,electromagnets having cores free from said reversing-switch but arrangedto control the same, independent 1 means for actuating therevcrsingswitch when one of the magnets is energized, circuits for saidmagnets, and a manually-operated switch in said circuits.

11. A motor, a reversing-switch therefor, electromagnets having coresfree from said reversing-switch but arranged to control the same,independent means for actuating the reversing-switch when one ofthemagnets is energized, combined with a brake, an electromagnet, and afree core therefor arranged to control said brake.

12. A motor, a reversing-switch therefor, electromagnets having coresfree from said reversingeswitch but arranged to control the same,independent means "for actuating the reversing-switch when one of themagnets is energized, combined with a brake, an electromagnet, a freecore therefor arranged to control said brake, circuits for thereversingswitch magnets, a manually-operated switch in said circuits,and means for supplying current to the brake when the motor-circuit isclosed.

13. In combination with a motor, an optoo position element in circuittherewith, an electroresponsive device for removing said oppos sitionelement from the motor-circuit and mechanical means comprising acentrifugal 's eed-governor dependent uponthe speed of t e motor forvarymg'the current in sald electroresponsive device.

14. In combination with a motor, an op position element in circuittherewith, a plurality of electromagnets arranged to control theopposition element, and mechanical means comprising a centrifugalspeed-governor denendent u on the speed of the motor a controlled by themagnets will be actuated position element in circuit therewith, a plusothat they short-circuit the opposition element step by step 16. Incombination with a motor, an oprality of electromagnets, contacts contrled by said magnets connected to and arranged to short-circuit saidopposition element, a-

speed-governor mechamcall connected to t e motor, circuits for saimagnets, and means actuated by said governor and in said circuits, forvarying the current in said magnets.

17. in combination with a motor, an opposition element in circuittherewith, a plurality of electroma nets comprising free cores, contactscontrolled by said cores connected to and arranged to short-circuit saidopposition element, a speed-goyernor mechanically connected to themotor, circuits for said magnets, and means actuated by said governorand in said circuits, for varying the current in said magnets inproportion to the speed of the motor.

18. In an elevator, a hoisting mechanism, a motor, a brake, anelectromagnet havin a free core, said core arranged tocontrol t e brake,an opposition element inthe motor circuit, an electroresponsive devicefor removingsaid opposition element from the motorcircuit, andmechanical means dependent upon the speed of the motor for varying thecurrent in said electroresponsive device.

19. In an elevator, a hoisting mechanism, a motor, a brake, anelectromagnet havin a free core, said core arranged to control t ebrake, an 0 position element inv the motorcircuit, a p urality ofelectroma ets comprising free cores, contacts contro ed by said coresconnected to and arranged to shortcircuit said opposition element, a seed-govr ernor mechanically connected to t e motor,

. circuits for said magnets, and means actuated by said governor and insaid circuits, for varying the current in saidv magnets in proportion tothe speed of the motor.

20. In an elevator, a car, a hoisting mechanism, a motor, a brake, anelectromagnet having a free core, said core arranged to control thebrake, an opposition elementin the motor-circuit, a plurality ofelect'romagnets comprising free cores, contacts controlled by said coresconnected to and arranged to shortcircuit said opposition element, a seed-governor mechanically connected to t e motor, circuits for saidmagnets, means actuated by said governor and in said circuits, forvarying the current in said magnets in proportion to the speed of themotor, and a manually-operated switch in the car. p

21.. In combination with a motor, a revers hag-switch therefor,electromagnets having cores free from said reversing-switch but arrangedto control the reversing-switch, independent means for actuating thereversing-- switch when one oi the magnets is energized, an oppositionelement in circuit with the motor, an electroresponsive device for re-.moving said .opposition element from the motor-circuit, and mechanicalmeans dependent upon the speed of the motor for varying the current insaid electroresponsive device.

22. In combinationwith a motor, a reversing-switcli therefor comprisingtwo sets of contacts, a therefor free rom said reversing-switch butarranged to control the same; ,inde endent means ior'actuati'ng thereversing-switch and closing either set of its contacts when thecorresponding one of said magnets is energized, an opposition element incircuit with the motor, a plurality of electromagne'ts comprising freecores, contacts controlled by said cores connected to and arranged toshortcircuit said opposition element, a s eed-governor mechanicallyconnected to t e motor, circuits for'said magnets, and means actuated bysaid governor and in said circuits, for varying the current in saidmagnets in proportion to the speed of the motor.

23. In an elevator, a car, a motor, a reversing-switch thereforcomprising two sets of contacts, a air of electromagnets, cores thereforfree om said reversing-switch but arranged to control the same,independent means for actuating the reversing-switch and closing eitherset of its contacts when the corair of electromagnets, cores' respondingone of said magnets is energized,

an opposition element in circuit with'the mot0r,-a plurality ofelectromagnets compris ing free cores, contacts controlled by said coresconnected to and arranged to shortcircuit sai opposition element, a seed governdr mechanically connected .to t e motor means actuated by saidgovernor and in said circuits, for varying the current in said magnetsin proportion to the speed of the motor,

and a switch in the car arranged to control having a free corearrangedto be lifted when the movement of the motor.

24. In combination with a motor, a brake, an electromagnet havin a freecore, said core arranged to control sai brake, a reversingswitch,electromagnets having cores free from said reversing-switch but arrangedto control the reversing-switch and independent means for actuating thereversing-switch when one of the latter magnets is energized, anoppositlon element in circuit with the motor, an

'electroresponsive device arranged to remove said opposition elementfrom the motor-circuit, and mechanical means dependent upon the speed ofthe motorfor varying the current in said electroresponsive device.

25. In combination with a motor, a brake, anelectromagnet having a freecore arranged to be lifted when the magnet is energized, means forreleasing the brake when the core is lifted, means de endent'u on theweight of the core for app ying the rake, a revers ing-switch comprisingtwo sets of contacts, a plan. of electromagnets, cores therefor free omsaid reversing-switch but ar'ran ed to control the same, independentmeans or. ac

tuating the reversingswitch and closing either set of itscontactswhen-the correspending one of said magnets is energized, an oppostion'element 1n circuit with the motor,

s a plurality of electromagnets comprising free cores, contactscontrolled by said cores connectedto and arranged to short-circuit saidopposition element, .a speed-governor meo anically connected to themotor, circuits for said magnets, and .means actuated by said governorand in said circuits for varying the current in said magnets inproportion to the speed of the motor. 1

26,- In combination with a motor, a brake, an electromagnet having afree core arranged to beliftedwhen the magnet is energized, means forreleasing the brake when the core islifited, means dependent u on theweight oftli'e core for applying the rake, a roversing-switch comprisingtwo sets of contacts, a

air of electromagnets cores therefor free om said TBVGISiIIg-ESWItCh butarranged to control'thesame, independent means'for ac- 5o tuatingthereversingswiteh and closing either sjet of its contacts when thecorresponding one of saidmagnets is energized, an

. opposition element in circuit withf'the motor,

' a plura'htyof electromagnets' com rising free cores, contactscontrolled'bysai cores connected-t'o and arranged to short-circuit-saidopposition element, a speed-governor. n e5 anrcally connectd to themotor, circuits for said ma et's, means, actuated by said overner ansaid: circuits for varying the ent in said magnets proportion to theSpedof' the motor, and a manually-operated circuit slam; @274 anelevator, a car, a' hoist1n'g' mesh;

a motor, a brake, an electromagnet' the ma et is energized, means forreleasing the bra e when the core is lifted, means dependent upon theweight of the core for applying the brake, a reversing-switch comprisingtwo sets of contacts, a pair of electromagnets, cores therefor free fromsaid reversingswitch but arranged to control the same, 111

ependent means for actuating the revers- .ment, a speed-governormechanically connected to the motor, circuits for said mag.- nets, meansactuated by said governor and in said circuits for varying the currentin said magnets, in proportion to the speed of the motor, and a manuallyoperated circuitcloser in the car whereby the movements of the motor andthe car may be controlled.

28. A motor, a governor connected to run withthe motor, reversing meansthereof and means controlled by the governor for ,pre-

venting the reversing of the motor before the motor has come to rest.

I 29. A motor, a reversing-switchcomprise ing two parts, and agovernor'connected torun with the motor and arranged to permit but oneof the two arts of the reversingswitch to be actuate at once.

30. An alternating-current motor, an opposition element in circuittherewith, an electroresponsive device for controlling said roo .f

opposition element, circuits for the electrores onsive device, andinductive means in sai circuits controlled by the speed of the motor andarranged to vary the current in the electrorespons'ive device.

31. An alternating-current motor, an opposition element in circuittherewith; an

electrorespons'ive device for controlling said '0' position element, a seed-governor' meciianically connected to t e motor, a circuit for theelectrores onsive device, and inductive means in sai circuit controlledby said governor and arranged to vary the current 1n said circuit. v 32.In combination'with a motor, a source m ets' having coresdisconnectedi'rom sa j reversing-switch but arranged to conactuating thereversing-switch when one of themagnets is energi'zed; 1 V

33. A source of alternating-current supply,

"a motor, a reversing-switch therefor, electroalternatin mine s supply,a reversingswitch for t e motor, alternatin ur-rent 'trolthe same,andinde'pendent mean's'for" magnets is energized, combined with a bra e,an alternating-current magnet, and-a free core therefor arranged tocontrol said brake. i

34. In combination with an alternatingcurrent motor, an oppositionelement in cirphase circuits for said magnets, and Imeans actuated bysaid governor and in' said circuits, for varying the current in saidmagnets. r

35. In an elevator, a car, a hoisting mechanism, an alternating currentmotor, a brake, an alternating-current magnet having a free core, saidcore arranged to control the brake, an opposition element in themotor-circuit, a plurality of electromagnets comprising free cores,contacts controlled by said cores connected toand arranged toshort-circuit said opposition element, a speed-governor mechanicallconnected to the .motor, singlephase circuits for said ma nets, meansactuated by said governor an in said circuits, for varying the current.in said magnets in proportion to the speed of the motor, and a manuallyoperated switch in the car.

36. In an elevator, at source of alternatingcurrent supply, a car, analternating-current motor, a reversing-switch therefor comprising twosets of contacts, a pair of alternatingcurrent magnets, cores therefordisconnected from said reversing-switch but arranged to control thesame, independent means for actuating the reversing-switch and closingeither set of its contacts when the correspondin one of said magnets isenergized, an oppositlon element in circuit with the motor, a pluralityof electroma nets comprising free cores, contacts control ed by saidcores connected to and arranged to short circuit said oppositionelement, alternating current-circults for saidmagnets, a speed-governormechanically connected to the motor, means actuated by said governor andin said circuits,

for varying the current in said magnets in proportion to the speed ofthe motor, and a switch in the car arranged to control the movement ofthe motor.

37; In an elevator, a source of alternatingcurrent supply, a hoistingmechanism, an alternating-current motor, a brake an alternating-currentmagnet having a tree core arranged to be lifted when the ma et isenergized, means for releasing the bra e when the core is lifted, meansdependent u on the weight of the core for applying the bra e, areversing-switch comprising two sets of contacts, pair ofalternating-current magnets, cores therefor free from saidreversing-switch but arranged to control the same, independent means foractuating the reversing sw itch and closing either set of its contactswhen the corresponding one of said magnets is energized, an oppositlonelement in circuit with the motor, a plurality of. electromagnets comrising free cores, contacts controlled b sai cores connected to andarranged to s ortcircuit said opposition element, a speed-governormechanically connected to the motor, alternating-current circuits forsaid magnets, means actuated by said governor and in said circuits forvaryingthe current in said magnets inproportion to the speed of themotor, and a manually-operated circuit-closer in the car whereby themovements of the motor and the car may be controlled.

38. In combination with a motor, an opposition element in circuittherewith, an electroresponsive device for removing said oppositionelement from the motor-circuit, and a centrifugal speed-governorconnected to the motor and arranged to control the current in saidelectroresponsive device.

39. In combination with a motor, an op osition element in circuittherewith, a plura ity of electromagnets arranged to ontrol theopposition element, and a centri ugal governor connected to the, motorarid arranged to con trol the operation of said magnets.

40. In combination with a motor, an opposition element in circuittherewith, an electroresponsive device arranged to short-circuit saiopposition element, a centrifugal speedgovernor mechanically connectedto the motor, circuits for the electroresponsive device, and meansactuated y said governor and in said circuits, for con rolling thecurrent in said electroresponsive device in proportion to the speed ofthe motor.

41. In combination with a motor, an oppo: sit-ion element in circuittherewith, a plurality of electromagnets comprising free cores, contactscontrolled by said cores connected to and arranged to short-circuit saidopposition element, a speed-governor mechanically connected to themotor, circuits for said magnets, means actuate by said governor and insaid circuits,.for antrollmg the current in said magnets proportion tothe 45. In an alternating-current controller, the combination of apluralityof magnets having free cores singlehase circuits for themagnets, an inductive evice in said circuits and a speed-governorarranged to control said inductive device.

' proportion to the speed of the motor.

47. An alternating-current motor, a cir cuit therefor, an oppositionelement in the motor-circuit, an electroresponsive device arranged tocontrol said opposition element, circuits for the electroresponsivedevice and inductive means in said circuits arrangedto control thecurrent in the electroresponsive device in proportion to the speed ofthe m o-. tor. v

48. An alternating-current motor, a circuit therefor, an oppositionelement in the motor-circuit, an electroresponsive device arranged tocontrol said opposition element, circuits for the electroresponsivedevice and inductive'means in said circuits arranged to vary the currentin the electroresponsive device in proportion to the speed of the motor.

' 49. "An alternating-current motor, a circuit therefor, an oppositionelement in the motor-circuit, an electroresponsive device arranged tocontrol said opposition element, a

winding for the electroresponsive device and inductive means arranged tocontrol the current in the electrores onslve device in pro-" portion tothe speed 0 the motor.

50. Inan elevator, a hoisting mechanism, a motor, a brake, anelectromagnetic actuator for controlling the brake, intermediatemechanism between the brake and the actua. tor, said actuator comprisinga iield'of laminated magnetic material, a winding and an armature oflaminated magnetic material disconnected from the brake mechanism,

circuits forthe brake-Winding, a source of singlefihase ,purrent-supplyand means for" contro ing the current insaid circuit. ,51. Inanelevator, a hoisting mechanism,

-a motor, a'brake, an electromagnetic actuator for controlling thebrake, said actuator having a field and an armature :of laminatedmagnetic material and a winding, a weight.

connected to said armature, a cylinder about i said weight, saidcylinder and weight '-formmotor-circuit, an elec 52. In an elevator, ahoisting mechanism, 1

' a motor, a brake, an electromagnet and a disconnected core thereforarranged to control the brake. K

53. In an elevator, a hoisting mechanism, a motor, a brake, anelectromagnet having a disconnected corearranged to be lifted when thema et is energized and means for releasing the rake when the core islifted.

54. In an elevator, a hoisting mechanism, a motor, a brake, anelectromagnet having a disconnected core arranged to be lifted when themagnet is energized, a spring for releasing the brake when the core islifted and means dependent upon the weight of the core for applying thebrake.

55. In an elevator, a hoisting mechanism, a motor, a brake, a magnet, asinglebase circuit for said magnet, a disconnecte core in said magnetarranged to be lifted when the magnet is energized and means forreleasing the brake when the core is lifted I 56. An alternatingcurrent-motor, a C11- cuit therefor, an opposition element in themotor-circuit, an electroresponsive device arranged to control saidopposition element, and inductive means arranged to control theelectroresponsive device in proportion to the speed of the motor. r

57. An alternating-current motor, a oncuit. therefor,anoppositionselement in the motor-circuit, an electroresponsivedevicearranged to control said opposition element, inductive meansarranged to control the electroresponsive device in proportion to thespeed of the motor and awinding for the inuctivemeans. v 1

58. An alternating-current motor, acircuit therefor, an oppgasitionelementin the roresponsive device arranged to control said oppositionelement, inductive means arranged tocontrol the electroresponsive,device in pro ortion to the speed of the motor, a circuit or saidinductive means and a source of current-supply for the circuit of theinductive means.

In testimony whereof I have signed my name to this specification 1n thepresence of two subscribing witnesses. I

, DAVID LARSON.

- Witnesses:' 1 1 H. GARRIsoN, 1 ALFRED G. BEcHEr.

